Table 2.
Bravo Crater (Bikini) Sediment Exposures
Bulk*
Film
XXII
XXII
Activity
(pCi/g)
Degrader
~~ 120
none
v 120
.00025" Mylar
Blank
Exposure
(mm *)
Time (Hrs.)
Tracks/mm?
v~ 0.11
522
0.11
525
Net R**
Xx 10"
739/23
32.02
5.11
827/23
35.85
5.72
788/23
34.15
5.42
828/23
35.89
5.70
741/18
41.06
6.51
414%
~ 120
-0005" Mylar
v0.11
525
TO9
XXT
Sensitivity***
(+ %S)
+0.91
377/23
16.28
2.58
372/23
16.06
2.55
NOTES;
*xActivity estimated as 45 pCi/g 24]am, 71 pCi/g 239° 24%u and 4 pCi/g 238Ppu based on analyses of
adjacent samples (V. Noshkin, pers. comm.).
k*AR = tracks/mm?; S = standard deviation, expressed as % of R, calculated for the average R from
tracks/mm* values for individual square millimeters.
*kkTracks per mm“ per pCi/g per hour of exposure (x 10").